亳州市涡北煤矿周边农田土壤重金属污染评价及来源解析

为开展煤矿周边农田土壤重金属污染程度及来源研究,采集了亳州市涡北煤矿周边农田105个表层土壤样品,测定了Ni、As、Cr、Zn、Cu、Cd和Pb 7种重金属的含量.利用污染指数法和潜在生态风险指数法对重金属污染程度进行评价,采用绝对主成分分数-多元线性回归(APCS-MLR)受体模型初步定量解析重金属的潜在来源.结果 表明,涡北煤矿周边农田土壤重金属含量总体处于较低水平,重金属Cd局部污染较为严重.涡北煤矿周边农田土壤中7种重金属主要受到自然因素与采矿、农业施肥等人为因素的影响.结论 显示,涡北煤矿周边农田土壤存在一定程度的重金属污染,重金属Zn与Cd的富集主要受矿业活动的影响.

Soil heavy metal pollution evaluation and sources analysis in the surrounding farmland of Guobei Coal Mine

This study aimed to further investigate the degrees of heavy metals pollution and identify sources of heavy metal pollution in the surrounding farmland soil of Coal Mine. 105 surface soil samples were collected from farmland around Bozhou Guobei Coal mine, the concentrations of Ni, As, Cr, Zn, Cu, Cd and Pb were determined in all the soil samples. The degrees of heavy metals pollution were evaluated by using pollution index method and potential ecological risk index method. The sources of heavy metals were identified by the absolute principal component score-multiple linear regression (APCS-MLR) receptor model. The results showed that: the concentrations of heavy metals in the surrounding farmland soil of Guobei Coal Mine was generally at a mild level, and Cd pollution was relatively serious. The seven heavy metals in the surrounding farmland soil of Guobei Coal Mine were mainly affected by natural factors, mining, agricultural fertilization and other human factors. It was believed that the heavy metals in the surrounding farmland soil of Guobei Coal Mine were polluted to a certain extent, and the accumulation of Zn and Cd were mainly affected by mining activities.